Facebook button not working – server error

I just got the same error but only on one post. I checked and double-checked the post’s code and saw no problems with it (which doesn’t mean there weren’t any – it’s late) but it’s interesting to see someone else got the error.

I was trying to forward this post:
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https://thepoliticalcarnival.net/2013/05/04/the-book-booth-may-days-edition/
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to Facebook.